20215616204 has 36 divisors (see below), whose sum is σ = 41674177440. Its totient is φ = 8554160160.

The previous prime is 20215616191. The next prime is 20215616207. The reversal of 20215616204 is 40261651202.

It is a super-2 number, since 2×20215616204² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20215616207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637307 + ... + 668274.

It is an arithmetic number, because the mean of its divisors is an integer number (1157616040).

Almost surely, 2^20215616204 is an apocalyptic number.

It is an amenable number.

20215616204 is an abundant number, since it is smaller than the sum of its proper divisors (21458561236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20215616204 is a wasteful number, since it uses less digits than its factorization.

20215616204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305678 (or 1305669 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 20215616204 in words is "twenty billion, two hundred fifteen million, six hundred sixteen thousand, two hundred four".